Rod or tool connecter



Patented Feb. 25, 1936 UNITED STATES PATENT OFFICE 2 Claims.

My present invention relates to the art of coupling devices and moreparticularly to a rod or tool connecter.

There are many conditions of use where it is desirable to coupletogether shafts, pipes or tool bits in a manner which will permit takingthe full compression load, by abutting the two elements joined together,in such a manner that the shock of hammering and compression strain willnot fall upon the coupling mechanism. This is true of control rods andthe like and most particularly in the case of percussion tools. It isfor this latter purpose that my invention has been conceived anddeveloped altho it is believed it will be clearly understood that therewill be many other uses which will suggest themselves to those skilledin this art.

In percussion tools it is very desirable to have drill bits which areeasily interchangeable yet which will absorb the full blow of thepercussion tool. 'Ihis can only be accomplished by having an extensionof the plunger element of the percussion tool engage in end to endcontact the tool bit itself. My device is particularly intended to servethis purpose and by virtue of the fact there is no screw connections, nothreads to become battered and in fact no load placed upon the couplingdevice itself, it can be depended upon to last for long periods underthe most unusual conditions.

Other and more specific objects will be apparent from the followingdescription taken in connection with the accompanying drawing, whereinFigure 1 is an elevation showing my device as used in holding a tool bitto the plunger of a percussion tool. Figure 2 is a longitudinalsectional View taken thru the device of Figure l, the cutting planebeing revolved degrees from Figure 1. Figure 3 is a view similar toFigure 1 showing certain parts of my device in section to betterillustrate the construction. Figure 4 is a View similar to Figure 3excepting the coupling device is shown in its released position wherethe tool is free for removal. Figure 5 is a cross sectional view takenalong the line 5-5 of Figure 4. Figure 6 is a cross sectional view takenalong the line 6 6 of Figure 3.

Referring to the drawing, throughout which like reference charactersindicate like parts, 8 designates the base sleeve of my coupler. Thisshould be fixedly secured in some convenient manner to the tool plungeror striker element I0. For sake of clarity in my present drawing I haveshown this sleeve being secured to piston IIJ by the thru rivet I2. Inactual practice. probably,

it would be most desirable to thread it onto plunger I6 or possibly weldor braise it to the same. Sleeve 8 as will best be seen from Figures 3and 4 is provided with a slot throughout its lower extent as I4. Thelower end of this slot is of limited width, just sufncient to pass a lugI6 which should be xedly secured to member I8 which might be a tool bitor one element of a control rod. Slot I4 has 4a portion of increasedwidth at 26 which is adapted to house the wedge lug 22. Slot I4 isfurther enlarged at its upper end and on the opposite side fromenlargement 20 as at 24 in an amount suiicient to nearly house lug I6.This enlargement should not however be the full thickness of lug I6otherwise the wedging action of wedge block 22 will be lost. It shouldfurther be provided with a flat side 26 of suflcient length so that lugI6 will have a bearing surface, parallel to its axis of movement, of agreater extent than its possible movement.

Encircling base sleeve 8 is the wedge lug sleeve 28. This sleeve litssuiiiciently loose on sleeve 8 so that it may slide thereon beingrestrained in its movements only by the inwardly extending lug 22 whichin the present illustrations I have shown as being riveted to sleeve 28.In actual construction any suitable means of securing this lug might beemployed. Lug 22 is wedge shaped after the show-ing of Figures 3 and 4and is of such a width that it can be passed thru slot I4. It is furtherprovided with the cam surface 30 which is adapted to engage lug I6. Inthe drawing I have indicated lug I6 as a pin. This is suitable for mostinstallations, however, where extreme strength and long resistance towear is required it might be desirable to make lug I6 of considerableextent along shaft I8 so that a bearing surface would be provided whichwould engage cam surface 3D instead of the line of contact which nowexists. Wedge lug 22 is normally held in its engaged position by theurgency of spring 32 which in turn is backed up by collar 34 secured asby threading thereto by means of set screw 36 to base sleeve 8. Inconstructing a coupler of this type it must be borne in mind that collar34 must be so positioned and spring 32 so proportioned that the movementof sleeve 28 will be suiiicient to place wedge block 22 in the lockedposition shown in Figure 3 and in the relief position shown in Figure 4.

Method of operation In operating my device, sleeve 28 is forceddownwardly against spring 32 until the position indicated in Figure 4 isreached. It is then possible to insert the shaft or tool bit I8 and tocarry it upwardly until shaft I8 is in intimate contact with shaft Il)as is illustrated in Figures 2 and 3. Shaft I8 may then be revolvedslightly with respect to shaft III after the showing of Figure Y3 andthe slide collar 28 released or the wedge may be relied upon to revolveit. Wedge block 22 then assumes the position shown in Figure 3 and it isimpossible to retract tool I8 without again slipping collar 28downwardly. In this position it will be noted that lug IB engages theflat surface 30 so that a limited movement is provided. This makesextreme accuracy of placement of lug I6 immaterial and accommodates thetool to a certain degree of wear and when in such a position lug I6 isnot required to absorb any of the percussion load. The same is! true ofa compression load such as might be experienced in a control rodassembly. K Y

The foregoing description and the accompanyingV drawing are believed toclearly disclose a preferred embodiment of 'my invention but it will beunderstood that this disclosure is merely illustrative and that suchchanges in the invention may be made as are fairly Within the scope andspirit of the following claims.

I claim:

1. In a coupling for a percussion tool, the

combination with a reciprocable striker and a socket-sleeve fixed at oneend to the striker, said 'Y sleeve having a slot opening at its otherend and a lateral locking-recess in the closed end of the slot, of aslidable tool in the sleeve, an exterior lug on the tool seated in saidrecess and adapted to pass through the open end of the slot, a cam-'-sleeve slidable and partially rotatable on .the socket-sleeve, an innercam lug rigid with the 'cam sleeve and engaging the exterior lug, andsaid slotted sleeve havinga release-recess to receive the cam lug topermit detachment of the tool.

2. In a tool coupling the combination with a socket-sleeve having anopen-end longitudinal slot, said slot having a locking-recess in onewall at its inner end and a release-recess in it opposite wall at therear of the locking-recess, of a detachable tool| having a locking lugto enter the locking recess, a cam-sleeve slidableon the socket-sleeve,an interior lug on the cam-sleeve adapted to seat in the release-recess,a cam edge on the interior lug for locking the rst lug in thelocking-recess, an end collar on the socketsleeve, and a spring coiledabout the socketsleeverand interposed between the cam-sleeve and the endcoll'ar.

JOSEPH H. BLAKE.

